3 Ld B, B 1 1 Meawhle, create a data mrrorg the storage mage for the task Suppose the mage dsk amed X', the aggregate Rd clude the data of dsk X', dvded Rd to M-data block B' B' B' 1 2 m, ad cotet the followg codtos: m 1 1 Rd B ', B ' m, m Local sychrozato module read data block B, add a header fle HEAD, HEAD s defed as: HEAD={CID,TID,NUM} The CID s the socket fle descrptor of the coect the task whch the data block correspodg belogs The TID s the task d of the task whch the data block correspodg The NUM s the umber of the data block, NUM= Set the data block wth header fle to the remote server oe by oe Remote sychrozato module read the header fle frst, fd the mage dsk locato by CID ad TID, ad used NUM to fd the correspodg data block the mage dsk B ' whch cotet NUM=, copy the data the B to B ' Whe all the data blocks are set to the remote server ad be processed, the data the mage dsk ad the target dsk be cosstecy The dversty sychrozato ca be used to mprove the speed f the task s t frst ru The dversty sychrozato got the same data copyg process wth the complete sychrozato The dfferece s the dversty sythrozato calculated dgest value for all data block before data copy Defe a structure S(B ) to store the data block B s dgest value Local sychrozato module calculate all the data block both the target dsk ad mage dsk Obta two queue store the dgest value S(B ) from target dsk ad S(B ') mage dsk The module compare the value of S(B ) ad the value of S(B ') wth the same umber, for example S(B 5 ) ad S(B 5 ') If the value of S(B ) ad the value of S(B ') are equal, gore the data block B I the opposte case the module trasfer the block B ad copy the data of B to B ', just lke the complete sychrozato 5 Wrte Order Costrats After the text edt has bee completed, the paper s ready for the template Duplcate the template fle by usg the Save As commad, ad use the amg coveto prescrbed by your coferece for the ame of your paper I ths ewly created fle, hghlght all of the cotets ad mport your prepared text fle You are ow ready to style your paper Ths system use parallel trasmsso to ehace trasfer speed The packet order whch packet processg module receved s t the correct order Applcatos mata the cosstecy of ther data by keepg track of modfcatos of ther data sets specal places I case of a system crash, the formato these jourals s suffcet to brg the data set to a cosstet state aga The applcato must esure that the wrte operato to update the joural s fshed before the update of the assocated data set takes place The applcatos use the fsyc or the fdatasyc[6] system calls to mpose wrte order costrats By usg these calls the applcatos are delayed utl all pedg wrte requests have bee processed If the prmary ode fals, the system have to restart from the curret state of the secodary ode's dsk For example, the system do t eed a defed order of the wrte operatos of data blocks B 0, B 1, B 2, B 3 ad B 4, sce they were ssued before ay of these IO requests had bee dow But t s possble that the applcato ssued the wrte request for block B 5 because the wrte operatos of B 0 ad B 3 were fshed Oly the applcato kows f ths s a real wrte-after-wrte depedecy, therefore we must ot volate a sgle possble depedecy Ths system approach s to keep a hstory of all recetly set wrte requests As soo as a sgle block of these fshes IO, a wrte barrer must be ssued, ad the hstory s cleared 287

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